Old school style stem - chrome quill - blue aluminum alloy top and cap. No name brand. Pretty much a copy of the 1980's Suntour stem.
Size: 21.1mm quill
Brand new, never mounted.
This is NOT anodized. Anodizing requires forged aluminum and this is a cast stem. The finish is a candy coat (translucent) paint which looks much like anodzing, but since it is paint it might have small nicks.